Pulp-screen.



G. E. POPE.

' PULP SCREEN.

APPLICATION FILED JAN.7,1913.

P gientea Feb. 2, 1915.

2 SHEETSSHEET 1.

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G. E. POPE.

PULP SCREEN.

APPLICATION FILED JAN. 7, 1913.

Patented Feb 2, N15.

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ATTORNEK CHARLES E.- FORE, OF HOLYOKE, MASSACHUSETTS, ASSIGNOR 6F THREE-FIFTHS TO B. F. PERKINS & SON, INCORPORATED, 015' HOLYOKE, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

To all whom it may concern:

Be it known that I, CHA'RLEs E. Pore, a citizen of the United States of America, residing at Holyoke, in the county of Hamp-, den and State of Massachusetts, have invented new and useful Improvements in Pulp-Screens, of which the following is a specification.

This invention relates to that class of apparatus used in screening paper pulp in paper making. Devices or the same general character have before bemused-for example, it is customary to provide a cylindrical, rotatable screen mounted 'to rotate,

partly immersed in a shallow tank. The unscreened pulp is fed into the interior of the cylindrical screen and the latter is both rotated and vibrated to cause the pulp to pass from the screen cylinder to the tank from which it overflows into a desired receptacle. The agitation tends to keep the screen openings clear and cause the pulp to flow therethrough freely. A stream' of water is directed through the openings in their upper travelto wash them clear of dirt, and means is provided to carry away the wash water Without mixing it with the pulp yet to be screened.

The particular point of novelty in the present invention lies in the arrangement and operation of a structure whereby the old results may be accomplished in a better manner. This is accomplished primarily by rotating the cylindrical screen and vibrating the receptacle or tank in which the screen rotates. The agitation ot'the screen openings is thus accomplished with an extremely simple arrangement.

The object of the invention is to provide an improved apparatus of the class described, and with thisobject in view the in vention will be described for the purpose of illustrating the preferred form.

In the drawings forming part of this application, Figure 1 is an end view showing the manner of mounting and vibrating the tank. Fig. 2 is a firont view of oneend only of the apparatus, the other end being brokenaway since it is essentially the end "shown.

The general arrangement of the rotatable screen and the flowof pulp to and from the apparatus is the same as specifically described in my co-pending application for PULP-SCREEN.

specification of Letters Patent. Application filed January 7, 1918. Serial No. 740,585.

Letters Patent of the United States filed December 1-1, 1912 under Serial No. 736,171.

Referring to Fig. 2 of the drawings: The pulp enters the screen I) through the pipe a *and after it is screened passes from'the tankv ri at the point e to any desired receptacle, not shown- The pipe 7 supplies the wash water directed through the screen openings in their upper travel, all as more clearly shown and described inthe above mentioned co-pending application. The

a-screen I), (mounted in the frame is) is rotatedfrom a power connection with the pulley g through the gearing h and z in an obvious manner. .The arrangement of the structure for mounting the tank and vibrating the same will now be specificallydescribed.

At each end of the frame is there is a cross-piece supported at each of its ends on the frame. Aboveeach cross-piece p is another cross piece distanced therefrom by rigid posts 1' and s placed at the ends there of. The ends of the cross-pieces p and (7, together with the posts 7- and-e, are fixed firmly to the frame is by suitable bolts, as shown clearly in Fig. 1. The crosspieces are thus supported at their ends only to the frame. They may be made of any suitable springy material which will allow a limited movement of the middle portions when the ends are rigidly supported. Applicant has found that cross-pieces made of hickory give thebest results because there is no tendency for the parts to crystallize after a great number of vibrations.

The tank (Z is fastened to the middle portions of the cross-pieces 7) and i by the bolts t. It Will thus be seen that the tank is suspended in position below the rotating screen I). If now, the tank is given a vibrating movement of limited extent While the screen cylinder 6 rotates partly submerged in the pulp of the tank, practically the same result will be obtained as if the screen were given the vibrating movement as Well as the rotary movement. The screen. openings will thus be kept clear.

A camshaft m is mounted in the frame I: and a cam 71. .at each end of the machine bears against the wear-block o fastened to the lower cross-pieces 72. As shown, one rotation of the shaft m forces the tank supporting the cross-pieces p and g, (and thus Patented Feb. 2, 1915.

the tank d) up and down four times. The continued rotation of the shaft m (driven in the manner shown in F ig. 2) vibrates the tank d thus sucking the pulp through the A of the cross-pieces 7) and q,'cause the cams n screen openings and keeping the latter clear. "The Weightof the tank, and the flexibility to be followed to about the right degree.

bross-piece's'and not by the cam, which is designed to operate the tank without supporting it.

' The preferred form, of the apparatus has been described for purposes of illustrating one embodiment of the invention and not for the purpose of limiting the invention to wise disconnected from the frame, a screen membermounted on the frame to occupy a position within the tank but spaced aparttherefrom, means to feed material to the screen member and mechanism to rapidly jog the tank whereby it is rapidly oscillated, due to its resilient supporting means.

2. A paper pulp screenapparatus com- The-weight of the tank is supported bythe prising, in combination, a shallow tank adapted to hold "paper pulp, leaf-spring members attached to said tank at their middle portions, a frame having means to firmly attach the ends of said leaf-spring members, whereby the tank is yieldingly supported, a rotatable, inelosedscreen having means to ,feedpulp-to the interior thereof, together with devices for rotating the screen and vibrating the suspended tank, whereby the screen openings are kept clear while submerged in the pulp of the tank.

3. A paper pulp screen apparatus comprising, in combination, a supporting frame, two horizontally arranged spaced springmembers mounted at each end of the frame with the ends thereof firmly fastened to the frame and with the middle portions free, a, shallow tank constructed to hold pulp supported and fastened to the middle free portions of the spring members, a rotatably ,mounted inclosed screen with means to feed pulp to the interior thereof arranged to rotate while partly submerged in the tank, a cam-shaft arranged under the tank-supporting springs, having cams adapted to vibrate the tank through its spring support, whereby the screen openings are kept clear while they are submerged in the pulp of the tank.

. CHARLES E. POPE. Witnesses: FRANKLIN G. NEAL,

' MINNIE C. Hor'rna. 

